The username can be used by others from the moment it is changed.
I found that "rika_nakai823" was available because I was adding it to my favorites by username, not by following.
Therefore, I ensured that it would not be misused by impersonation.
Ex) rika_nakai + 822, 893, etc.
Rika Nakai's username has been changed from "rika_nakai823" to "rika_n24x".
Please check on the NGT48 official website.
ngt48.jp/profile/detail…
Keep this username ( rika_nakai823 ) for a while to protect it from mischief.
The holder of this username is not related to "Opime".